Portable memory storage device



FIG. 1 is a first perspective view of a portable memory storage device, showing the new design;

FIG. 2 is a second perspective view thereof;

FIG. 3 is a left side view thereof;

FIG. 4 is a right side view thereof;

FIG. 5 is a top view thereof;

FIG. 6 is a bottom view thereof;

FIG. 7 is a front view thereof; and,

FIG. 8 is a rear view thereof.

Features shown in broken lines in the drawings are not part of the claim. 

CLAIM The ornamental design for a portable memory storage device, as shown and described. 